You can definitely get pregnant that way. Precum carries a lt of sperm. Your swollen clitoris could just be from being new to having sex. I hate to sound like my mom here but if you aren't educating yourself about how you could possibly get pregnant, then you are going to be in for a rude awakening. Do the research and use a condom. If you don't want to use condoms and you and your boyfriend are in a monogamous relationship then you need to get on birth control.
i just realized the swelling might be because i am on an allergy treatment where they inject me with things that im allergic to so my body becomes immune to it. so i might be getting an allergic reaction. because it makes my allergies worse untill my body gets immune. if it doesnt go away ill go see a doctor. thank you!
I've never heard of a swollen clitoris as a sign of pregnancy, so I doubt it, BUT you can get pregnant from pre-ejaculate, so you should make sure he uses a condom, especially if you aren't on birth control yourself or are but aren't taking it at the same time every day.